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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 281 for “"angle of attack"”.
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The hemisphere-cylinder at an angle of attack
An experimental investigation was carried out of the flow over a hemisphere-cylinder at angles of attack (α = 0° to 90°, Visualizations of skin-friction lines were conducted and were focused mainly on the development of the laminar separation bubble as a function of angle of attack, the conditions …
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Control of the space shuttle angle-of-attack during reentry
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2002.
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Comparison of Three Angle of Attack (AOA) Indicators: A Usability Study
<p>Angle of Attack (AOA) is an important aeronautical concept used to understand the performance status of an aircraft during different flight stages. The Federal Aviation Administration (FAA) has indicated the importance of developing and encouraging the use of affordable AOA based systems to …
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Reentry Vehicle Aerodynamics and Control at Very High Angle of Attack
… reentry test vehicle spins during the deployment of the drogue parachute. An experimental aerodynamic study has been conducted at the University of Illinois using a scale model of the X-38 to explore the cause of this problem. A six-component sting balance was used to measure the forces and …
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Trim Angle of Attack of Flexible Wings Using Non-Linear Aerodynamics
… to play a significant role in the design of future high-performance aircraft (Blended-Wing Body, Truss-Braced wing, High Speed Civil transport, High-Altitude Long Endurance aircraft and future military aircraft). Also, the availability of supercomputers has made it now possible to employ …
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A comparison of control design options for high angle-of-attack flights
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1991, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science.
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High Angle of Attack Forebody Flow Physics and Design Emphasizing Directional Stability
… for understanding the fundamental physics of flowfields over forebody type shapes at low speed, high angle of attack conditions with special emphasis on sideslip has been established. Computational Fluid Dynamics (CFD) has been used to study flowfields over experimentally investigated …
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An Aerodynamic Model for Use in the High Angle of Attack Regime
… reduction methods are developed on the basis of multirate digital signal processing. Since the model is sting mounted, the frequencies associated with sting vibration are included in balance readings thus a linear filter must be used to extract out the aerodynamic responses. To achieve this, a …
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Analysis of the dynamic stability derivatives for high angle of attack aircraft
… to fly and be controlled over a wide variety of flight conditions. In order to predict the aircraft behavior and control requirements over the entire flight regime it is necessary to have a proper aerodynamic model. Flight conditions at high angles of attack lead to separated flows making the …
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Identification of an Unsteady Aerodynamic Model up to High Angle of Attack Regime
… reduction methods are developed on the basis of multirate digital signal processing techniques. Since the model is sting-mounted to the support system of DyPPiR, the Discrete Fourier Transform (DFT) is first used to identify the frequencies of the elastic modes of sting. Then the sampling rate …
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Laminar and turbulent convective heat transfer over bodies at an angle of attack
… laminar and turbulent heat transfer over bodies of revolution at angles of attack. These methods are restricted to hypersonic flows over bodies with highly cooled walls. A method is presented for determining the surface inviscid streamline geometry and coordinate scale factors, which are required …
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Direct numerical simulation of an aerofoil at high angle of attack and its control
Detailed analysis of the flow around a NACA0020 aerofoil at moderate low chord Reynolds number (Rec = 2×104) in completely stalled conditions has been carried out by means of Direct Numerical Simulations. The stalled condition is either a steady configuration at a fixed angle of attack (α = 20o) or …
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Analysis of High Angle of Attack Maneuvers to Enhance Understanding of the Aerodynamics of Perching
… aerodynamics, mimicking the flight maneuvers of natural flyers requires a deep understanding of the unsteady flow physics while also demanding the ability to expand the vehicle's flight envelope beyond normal conditions. Experimental and computational investigations are performed to study and …
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Flowfield measurements in the vortex wake of a missile at high angle of attack in turbulence
The flowfield downstream of a vertically-launched surface-to-air missile model at an angle of attack of 50° and a Reynolds number of 1.1 x 10(5) was investigated in a wind tunnel of the Naval Postgraduate School. The goal of this thesis is to experimentally validate the pressure measurement system …
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Aerodynamic Study of Forces due to Wind Velocity and Angle of Attack on Parabolic Solar Troughs
<p>Scant literature exists of the atmospheric effects on parabolic solar troughs. The technology is relatively new, so supporting studies by consequence are as well.</p> <p>This study examines the effects of wind at various speeds, with various angles of attack on parabolic solar troughs. This …
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Measurement of unsteady aerodynamic characteristics of a subscale aerobatic aircraft in high angle-of-attack maneuvers
High angle-of-attack flight testing was performed using the UIUC Subscale Sukhoi, which is a 35% scale, 2.6 m (102 in) wingspan Sukhoi 29S electric model aircraft that was developed at the University of Illinois at Urbana-Champaign. The aircraft was instrumented with a custom sensor data …
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Steering of a boost vehicle to a desired flight path angle trajectory using angle of attack control
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1983.
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The effects of nose and corner radii on the flow about blunt bodies at angle of attack
… has been conducted to determine the effects of nose and corner radii on the pressure distribution and shock geometry for blunt bodies at angle of attack. Experimental pressure distributions were measured on a family of blunt, axisymmetric bodies which included a range of ratios of body radius …
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The Effects of Angle-of-Attack Indication on Aircraft Control in the Event of an Airspeed Indicator Malfunction
<p>Analysis of accident data by the Federal Aviation Administration, the National Transportation Safety Board, and other sources show that loss of control is the leading cause of aircraft accidents. Further evaluation of the data indicates that the majority of loss of control accidents are caused …
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